简介:Thecoherencecubetechnologyhasbecomeanimportanttechnologyfortheseismicattributeinterpretation,whichextractsthediscontinuitiesoftheeventsthroughanalyzingthesimilaritiesofadjacentseismicchannelstoidentifythefaultform.Thecoherencecubetechnologywhichusesconstanttimewindowlengthscannotbalancetheshallowlayersandthedeeplayers,becausethefrequencybandofseismicdatavarieswithtime.Whenanalyzingtheshallowlayers,thetimewindowwillcrossoveralotofevents,whichwillleadtoweakfocusingabilityandfailuretodelineatethedetails.Whilethetimewindowwillnotbelongenoughforanalyzingdeeplayers,whichwillleadtolowaccuracybecausethecoherencesnearthezeropointsoftheeventsareheavilyinfluencedbynoise.Forsolvingtheproblem,weshouldmakearesearchonthecoherencecubetechnologywithself-adaptivetimewindow.Thispaperdeterminesthesamplepoints’timewindowlengthsinrealtimebycomputingtheinstantaneousfrequencybandswithWaveletTransformation,whichgivesacoherencecomputingmethodwiththeself-adaptivetimewindowlengths.Theresultshowsthatthecoherencecubetechnologywithself-adaptivetimewindowbasedonWaveletTransformationimprovestheaccuracyoffaultidentification,andsupressesthenoiseeffectively.Themethodcombinestheadvantagesoflongtimewindowmethodandshorttimewindowmethod.
简介:Roadfrictioncoefficientreal-timeestimationmethodsisanimportantissueandprobleminautomotiveactivesafetycontrolsystemdevelopment.Firstafixedfeedbackgainslidingmodeobserverofroadadhesioncoefficientisdesignedthroughtheestablishmentoftire/roaddynamicfrictionmodelinthisarticle.Thesimulationresultsshowsthattheobservercanwellreal-timeidentifythecurrentroadadhesioncharacteristics.Andmoreimportantly,theobserveronlyneedwheelspeedsignalandthebrakingtorque(brakepressure)signal,sothesystemislowcost,anditsadaptabilityisgood.Thereisnodoubtthisestimationmethodhasagoodapplicationprospect.
简介:SystemoptimizationplaysacrucialroleindevelopingVRsystemafter3Dmodeling,affectingthesystem'sImmersionandInteractionperformanceenormously.Inthisarticle,severalkeytechniquesofoptimizingavirtualminingsystemwerediscussed:optimizing3DmodelstokeepthepolygonnumberinVRsystemwithintargethardware'sprocessingability;optimizingtexturedatabasetosavetexturememorywithperfectvisualeffect;optimizingdatabasehierarchystructuretoacceleratemodelretrieval;andoptimizingLODhierarchystructuretospeeduprendering~
简介:国务院发展研究中心国际技术经济研究所陈宝国博士在和记者的对话中,对物联网的概念和意义做了解读,并对中国物联网发展现状、发展路径以及RFID技术在物联网产业中的机遇做了分析。